diff --git a/website/themes/moderncpp/layout/layout.ejs b/website/themes/moderncpp/layout/layout.ejs
index cd4483e..aab1b00 100755
--- a/website/themes/moderncpp/layout/layout.ejs
+++ b/website/themes/moderncpp/layout/layout.ejs
@@ -23,10 +23,17 @@
 
   </head>
   <body class="<%- isIndex ? '' : 'docs' -%>">
-    <div id="mobile-bar" data-bg-text="高速上手 C++ 11/14/17/20" <%- isIndex ? 'class="top"' : '' %>>
-      <a class="menu-button"></a>
-      <a class="logo" href="/modern-cpp/"></a>
-    </div>
+    <% if (page.type == 'book-en-us') { %>
+      <div id="mobile-bar" data-bg-text="C++ 11/14/17/20 On the Fly" <%- isIndex ? 'class="top"' : '' %>>
+        <a class="menu-button"></a>
+        <a class="logo" href="/modern-cpp/"></a>
+      </div>
+    <% } else {%>
+      <div id="mobile-bar" data-bg-text="高速上手 C++ 11/14/17/20" <%- isIndex ? 'class="top"' : '' %>>
+        <a class="menu-button"></a>
+        <a class="logo" href="/modern-cpp/"></a>
+      </div>
+    <% } %>
     <%- partial('partials/header') %>
     <% if (!isIndex) { %>
       <div id="main" class="fix-sidebar">
diff --git a/website/themes/moderncpp/source/modern-cpp/css/_header.styl b/website/themes/moderncpp/source/modern-cpp/css/_header.styl
index ec44591..f22f9d5 100755
--- a/website/themes/moderncpp/source/modern-cpp/css/_header.styl
+++ b/website/themes/moderncpp/source/modern-cpp/css/_header.styl
@@ -125,6 +125,7 @@ body.docs
   z-index: 100
   display: none
   box-shadow: 0 0 2px rgba(0,0,0,.25)
+  font-size: 0.9em
   .menu-button
     position: absolute
     width: 24px
@@ -137,7 +138,7 @@ body.docs
     position: absolute
     width: 25px
     height: 30px
-    background: url(../assets/cover-2nd.png) center center no-repeat
+    background: url(../assets/cover-2nd-en.png) center center no-repeat
     background-size: auto 100%
     top: 12px
     right: 12px
